Metrohm 806 Exchange Unit - Manual (Page 19)

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3 Installation
806 Exchange Unit
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2 Check the position of the piston rod on the underside of the
exchange unit.
The recess of the piston rod must be tight with the buret base and
the smooth surface with the opening must be directed to the rear.
3 Correct the position of the piston rod with the 6.2739.010 key if
necessary.
NOTE
In case of carelessly handling the 6.2739.010 key, the data chip of
the exchange unit may be damaged. Avoid touching the white
ceramic holder of the data chip!
4 Attach the exchange unit from the front onto the control device and
push all the way to the rear, so that it snaps in and the LED Status
flashes slowly.
It must snap in audibly.